/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2022, Hongtai Liu <lht856@foxmail.com>
 * Ha Thach (tinyusb.org)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * This file is part of the TinyUSB stack.
 */

#include "stm32u5xx_hal.h"
#include "bsp/board.h"
#include "board.h"

//--------------------------------------------------------------------+
// Forward USB interrupt events to TinyUSB IRQ Handler
//--------------------------------------------------------------------+
void OTG_FS_IRQHandler(void)
{
  tud_int_handler(0);
}

//--------------------------------------------------------------------+
// MACRO TYPEDEF CONSTANT ENUM
//--------------------------------------------------------------------+

UART_HandleTypeDef UartHandle;

void board_init(void)
{

  board_clock_init();

  // Enable All GPIOs clocks
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();
  __HAL_RCC_GPIOC_CLK_ENABLE();
  __HAL_RCC_GPIOD_CLK_ENABLE();
  __HAL_RCC_GPIOE_CLK_ENABLE();
  __HAL_RCC_GPIOF_CLK_ENABLE();
  __HAL_RCC_GPIOG_CLK_ENABLE();
  __HAL_RCC_GPIOH_CLK_ENABLE();

  UART_CLK_EN();

#if CFG_TUSB_OS == OPT_OS_NONE
  // 1ms tick timer
  SysTick_Config(SystemCoreClock / 1000);
#elif CFG_TUSB_OS == OPT_OS_FREERTOS
  // If freeRTOS is used, IRQ priority is limit by max syscall ( smaller is higher )
  NVIC_SetPriority(OTG_FS_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY);
#endif

  GPIO_InitTypeDef GPIO_InitStruct;

  // LED
  GPIO_InitStruct.Pin = LED_PIN;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_PULLUP;
  HAL_GPIO_Init(LED_PORT, &GPIO_InitStruct);

  // Button
  GPIO_InitStruct.Pin = BUTTON_PIN;
  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(BUTTON_PORT, &GPIO_InitStruct);

  // IOSV bit MUST be set to access GPIO port G[2:15] */
  HAL_PWREx_EnableVddIO2();

  // Uart
  GPIO_InitStruct.Pin = UART_TX_PIN | UART_RX_PIN;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = UART_GPIO_AF;
  HAL_GPIO_Init(UART_GPIO_PORT, &GPIO_InitStruct);

  UartHandle.Instance = UART_DEV;
  UartHandle.Init.BaudRate = CFG_BOARD_UART_BAUDRATE;
  UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
  UartHandle.Init.StopBits = UART_STOPBITS_1;
  UartHandle.Init.Parity = UART_PARITY_NONE;
  UartHandle.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  UartHandle.Init.Mode = UART_MODE_TX_RX;
  UartHandle.Init.OverSampling = UART_OVERSAMPLING_16;
  UartHandle.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
  UartHandle.Init.ClockPrescaler = UART_PRESCALER_DIV1;
  UartHandle.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;

  HAL_UART_Init(&UartHandle);

  /* Configure USB FS GPIOs */
  /* Configure DM DP Pins */
  GPIO_InitStruct.Pin = (GPIO_PIN_11 | GPIO_PIN_12);
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
  GPIO_InitStruct.Alternate = GPIO_AF10_USB;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /* Configure ID pin */
  GPIO_InitStruct.Pin = GPIO_PIN_10;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
  GPIO_InitStruct.Pull = GPIO_PULLUP;
  GPIO_InitStruct.Alternate = GPIO_AF10_USB;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

#if OTG_FS_VBUS_SENSE
  // Configure VBUS Pin
  GPIO_InitStruct.Pin = GPIO_PIN_9;
  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  // Enable VBUS sense (B device) via pin PA9
  USB_OTG_FS->GCCFG |= USB_OTG_GCCFG_VBDEN;
#else
  // Disable VBUS sense (B device) via pin PA9
  USB_OTG_FS->GCCFG &= ~USB_OTG_GCCFG_VBDEN;

  // B-peripheral session valid override enable
  USB_OTG_FS->GOTGCTL |= USB_OTG_GOTGCTL_BVALOEN;
  USB_OTG_FS->GOTGCTL |= USB_OTG_GOTGCTL_BVALOVAL;
#endif // vbus sense

  /* Enable USB power on Pwrctrl CR2 register */
  HAL_PWREx_EnableVddUSB();

  /* USB_OTG_FS clock enable */
  __HAL_RCC_USB_OTG_FS_CLK_ENABLE();
}

//--------------------------------------------------------------------+
// Board porting API
//--------------------------------------------------------------------+

void board_led_write(bool state)
{
  HAL_GPIO_WritePin(LED_PORT, LED_PIN, state ? LED_STATE_ON : (1 - LED_STATE_ON));
}

uint32_t board_button_read(void)
{
  return BUTTON_STATE_ACTIVE == HAL_GPIO_ReadPin(BUTTON_PORT, BUTTON_PIN);
}

int board_uart_read(uint8_t *buf, int len)
{
  (void)buf;
  (void)len;
  return 0;
}

int board_uart_write(void const *buf, int len)
{
  HAL_UART_Transmit(&UartHandle, (uint8_t *)(uintptr_t)buf, len, 0xffff);
  return len;
}

#if CFG_TUSB_OS == OPT_OS_NONE
volatile uint32_t system_ticks = 0;
void SysTick_Handler(void)
{
  HAL_IncTick();
  system_ticks++;
}

uint32_t board_millis(void)
{
  return system_ticks;
}
#endif

void HardFault_Handler(void)
{
  asm("bkpt");
}

// Required by __libc_init_array in startup code if we are compiling using
// -nostdlib/-nostartfiles.
void _init(void)
{
}